凯德石英：关于变更持续督导保荐代表人的公告

Group 1 - The core announcement is that Kaide Quartz has appointed Ms. Xu Meng as the new sponsor representative to replace Mr. Li Tongchao for ongoing supervision duties [2] - The appointment is part of the company's commitment to continue fulfilling its ongoing supervisory responsibilities [2] - The announcement was made on the evening of December 3 [2]